No luck with the airliner 747 today, 3 attempts couldn't get off the ground.
1. Not enough surface area on the elevators.
2. Not enough smooth take off surface.
3. Nose retract failed on all 3 attempts.

Back to the drawing board. It would have taken off eventually if the retracts didn't fail.

So, the only thing I see wrong there is the battery; it's not nearly big enough to handle anything close to 18A. I don't know what that motor will draw with that fan, but 18A would be a 50C discharge rate. Firstly, the battery won't handle it, and secondly, even if it did, it's only going to run for a little over a minute. Something like 1500mAh is more like it.

You can run two ESCs off one channel, use a y-lead and remove the middle pin from one ESC lead (so the BECs don't argue with each other).